题干

单词翻译。

____n. 允许  ②____v. 猜测   ③____n. 协议

____n. 关系  ⑤____v. 交流  ⑥____v. 争吵

____n. 云  ⑧____adj.年纪较大的 ⑨____adv.代替

____pron. 任何

上一题 下一题 0.0难度 选择题 更新时间:2015-09-06 03:40:11

答案(点此获取答案解析)

allow,guess,deal,relation,communicate,argue,cloud,elder,instead,any

同类题2

在细胞免疫中,效应T细胞杀伤靶细胞主要有两种途径:细胞裂解性杀伤(图1)和诱导细胞凋亡(图2).前者指效应T细胞分泌诸如穿孔素一类的介质损伤靶细胞膜,后者指效应T细胞通过表面FasL,与靶细胞表面的Fas结合,诱导靶细胞凋亡.请分析并回答:

(1)人体内的效应T细胞来自____ 的增殖、分化.

(2)图1中的穿孔素又称“成孔蛋白”,由效应T细胞产生并以____ 的方式释放到细胞外.穿孔素能在靶细胞膜上形成多聚穿孔素管状通道,使K+及蛋白质等大分子物质____ (流入/流出)靶细胞,最终导致靶细胞死亡.

(3)图2中的FasL又称死亡因子,Fas又称死亡因子受体,它们都是由细胞合成并定位于细胞表面的蛋白质.一般来说,控制FasL的基因____ (填“是”或“不是”)只在效应T细胞和某些细胞内表达.

①Fas和FasL的结合体现了细胞膜的____ 功能,控制合成Fas和FasL的基因____ (填“是”或“不是”)共存于一个细胞中.

②研究发现,某些肿瘤细胞能够调节Fas和FasL基因的表达水平,从而使自己逃脱免疫系统的清除.此时,肿瘤细胞内Fas基因的表达变化情况是____ (填“升高”“不变”或“降低”).免疫排斥是器官移植的一个主要障碍,根据上述实例及Fas和FasL的相互关系,可考虑____ 基因的表达,从而为解决免疫排斥提供一种新的思路.

同类题5

阅读下列短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。

    At least 40% of Australian households now have at least one home “Internet of Things” device. These are fridges, window blinds, locks and other devices that are connected to the Internet.

    While the Internet of Things (IoT) may lead to more efficiency in our daily lives, my research shows that consumers are exposed to many risks by the use of IoT devices, ranging from disclosure of private information, to physical injury and problems with the devices themselves.

    Australia has no specific laws aimed at addressing IoT issues, and current laws intended to protect consumers have gaps and uncertainties when dealing with IoT devices. Many IoT device manufacturers and suppliers show little regard for customers' privacy. Some even make money from customer data.

    Consumer electronics company Vizio recently agreed to pay US regulators US $ 2.2 million, after failing to get appropriate permission from users to track their TV viewing habits.

    Late last year, the Norwegian Consumer Council found that a children's doll recorded anything said to it by children and sent the recordings to a US company. The company reserved the right to share and use the data for a broad range of purposes.

    IoT devices have the potential to collect more private data about individuals than was possible with previous devices. All this data can then be used to study consumers, predict our behavior, and sell us products at times when our willpower is lowest. Some companies are currently using technology to track consumers through stores and send their messages to mobile phones. This may be linked to our purchase history.

    Consumers are exposed to significant risks from IoT devices, from the use of data, to security flaws and devices no longer being supported. They should think long and hard about the risks they are taking on with IoT devices. Do you really need that internet-connected hairbrush?